mixture of substance based on (1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[carboxy(polyethylene glycol)-2000]/(2-aminoethoxy)({2,3-bis[(9Z)-octadec-9-enoyloxy]propoxy})phosphinic acid/N,N,N-trimethyl-2,3-bis[(9Z)-9-octadecenoyloxy]-1-propanaminium)